/Engine/Plugins/Enterprise/DatasmithImporter/Source/ExternalSource/Public/ExternalSource.h
Synchronously load the DatasmithScene. Upon success,GetDatasmithScene()should return a valid scene.
a valid SharedPtr if the operation was successful.
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [IDatasmithScene](API\Runtime\DatasmithCore\IDatasmithScene) > LoadImpl()